To build any structure in the game you should open the Store (icon with a hammer depicted on it located in the lower part of the screen) and choose the construction you need in the relative tab of the opened window. In case the building isn't available, tap on its icon in the Store and the game will show what you should do to open it.
You can get new buildings in the Store only. In case there are some buildings in your Inventory, you can take them out only on the island where they were originally constructed. At the moment there is no opportunity to transfer buildings between islands.
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